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The photoelectric effect
dna.pdb
192255192
Photovoltaic Effect and Solar Energy
(Page 2)
Activity: Build your own solar panel
If you are the electrical engineer chosen by a power company to design a next generation solar power plant from scratch, do you think you are ready for the job? It may not be as difficult as you thought it might be. Let's have a try!
I. Material
As the chief engineer, you are responsible for the selection of material to make the solar panels, though you may not need to get your hands dirty on actually building it.
II. Catching the Sunshine
Once a specific material is choosen, only a small band of spectrum of sunlight can be absorbed. If you need to review the relationship between wavelength and energy, go HERE.
Test your knowledge before you start,
Run the simulation below and determine whether the visible sunlight with a higher energy level or lower energy level can be absorbed in this model.
III. Connecting the grids
Before your solar power plant connects the electric grids and sends electricity to cities and towns from Boston to Boise, there is an important issue to be considered. Currently electricity is transmitted in Alternating Current (AC). Is electricity generated by photovoltaic panels like the one above Alternating or Direct Current (DC)? For AC, a step-up transformer is needed to increase the voltage ready for transmission. For DC, on the other hand, an inverter is needed to make it Alternating Current before transmission.
IV. Pro and Con List
Now that you have finished the design of the solar project, you have one more important thing to do before you can bring your brainchild to life. You need to convince your management and investors that the project is viable and profitable. To make your arguements, you need to present the myriads of advantages of solar energy. But in order to bring your audience to your side, you also need to be objective and realistic with the limitations of solar power. When considering the drawbacks, you should also think about the impact of such a grand project on your customers that operate continously; think about the stress on power grid, while not limit yourself to the few points mentioned on Page 1. List your pros and cons in the boxes below and have a discussion with your partner about your points.
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Question: Considering the close relationship between photoelectric effect
and ionization of atoms, which one do you think is the best material to
achieve maximum current, metals, non-metals or metaloids?
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Metals, such as Sodium
Non-metals, such as Carbon
Metaloids, such as Silicon
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Question: The energy of electromagnetic radiation is ______ proportional
to the frequency of the radiation.
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directly
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Question: And the frequency of the radiation is ______ proportional to the
wavelength of the radiation.
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<font size="4">The material used in the above applets tends to absorb
photons with a ________ energy level</font>.
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<font size="4">Based on the mechanism of photovoltaic panels and the above
model, electricity generated from PV panels is in _________.</font>
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Alternating Current
Direct Current
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